Thread: beginner loop help

this is the code i have for my program. i'm having trouble keeping the output in integer format since i'm multiplying by floating point numbers. i'm also having a problem with the last output, mine keeps coming up as 281. if someone could help me out that'd be great.

our output should look like this:

How many jackalopes do you have? 200
How many generations do you want to wait? 1
If you start with 200 jackalopes and wait 1 generations,
you'll end up with a total of 204 of them.

How many jackalopes do you have? 132
How many generations do you want to wait? 2
If you start with 132 jackalopes and wait 2 generations,
you'll end up with a total of 137 of them.

How many jackalopes do you have? 40
How many generations do you want to wait? 100
If you start with 40 jackalopes and wait 100 generations,
you'll end up with a total of 291 of them.

Code:

// This program calculates population growth using a loop. 

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{

  int jacks,   // initial number of jackalopes
      gens;    // number of generations 

  const float birthRate = .03,   // birth rate
	deathRate = .01;   // death rate

  // Ask user initial jackalope population.
  cout << "How many jackalopes do you have? \n";
  cin >> jacks;

  // Ask user how many generations will be calculated.
  cout << "How many generations do you want to wait? \n";
  cin >> gens;

  int newPop,    // population of jackalopes including births 
      newPop2;   // population of jackalopes including deaths
  newPop = jacks; 

  cout << showpoint << fixed << setprecision(2);   

  for (int i = 1; i <= gens; i++)
  { 
    newPop = (newPop * birthRate) + newPop;  // calculate new population of jackalopes
    newPop2 = newPop - (newPop * deathRate);  // calculate how many jackalopes die
    newPop = newPop2;  // total population
  }

  cout << "If you start with "<< jacks <<" jackalopes and wait "<< gens <<" generation(s), \n";  
  cout << "you'll end up with a total of "<< newPop2 <<" of them. \n";

  return 0;

}